Lessons learned from operating a solid oxide electrolysis cell at -1.25 a/cm2 for one year

M. Chen, X. F. Tong, S. Ovtar

Research output: Contribution to journalConference articleResearchpeer-review

7 Downloads (Pure)

Abstract

Conventional Ni/yttria stabilized zirconia (YSZ) fuel electrode supported solid oxide electrolysis cells (SOECs) demonstrate acceptable long-term durability when operated at below -1 A/cm2. These cells suffer however severe degradation at above -1 A/cm2, where a large part of the cell resistance increase is associated with the Ni/YSZ electrode. In this work, by introducing Ce0.8Gd0.2O2-δ (CGO) nanoparticles into the Ni/YSZ electrode, we reduce the cell degradation down to 39 mV/kh when operated at 810 °C and -1.25 A/cm2. A steam supply failure at 4000 h causes certain damage to the cell, resulting in higher degradation in the second half of the one-year period. A degradation-mitigation strategy is successfully tried out by increasing the operating temperature to 836 °C eventually. The test is successfully terminated after reaching one year, demonstrating an average degradation rate of 39 mV/kh over the one-year period. The current work shows the potential of modifying conventional SOEC cells for use in high current density electrolysis applications.
Original languageEnglish
JournalECS Transactions
Volume103
Issue number1
Pages (from-to)475-486
Number of pages12
ISSN1938-5862
DOIs
Publication statusPublished - 2021
Event17th International Symposium on Solid Oxide Fuel Cells - Stockholm, Sweden
Duration: 18 Jul 202123 Jul 2021
Conference number: 17

Conference

Conference17th International Symposium on Solid Oxide Fuel Cells
Number17
Country/TerritorySweden
CityStockholm
Period18/07/202123/07/2021

Fingerprint

Dive into the research topics of 'Lessons learned from operating a solid oxide electrolysis cell at -1.25 a/cm<sup>2</sup> for one year'. Together they form a unique fingerprint.

Cite this